/*
 * To change this template, choose Tools | Templates
 * and open the template in the editor.
 * Svetlana Shikhutskaya
 */
package admin;

import entity.Groups;
import entity.Users;
import facade.GroupsFacadeLocal;
import facade.UsersFacadeLocal;
import java.io.IOException;
import java.util.Collection;
import javax.ejb.EJB;
import javax.servlet.ServletException;
import javax.servlet.annotation.HttpConstraint;
import javax.servlet.annotation.ServletSecurity;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

/**
 *
 * @author Svetlana Shikhutskaya
 */
@ServletSecurity(@HttpConstraint(rolesAllowed={"Administrator"}))
public class DeleteGroup extends HttpServlet {
    @EJB
    private UsersFacadeLocal usersFacade;

    @EJB
    private GroupsFacadeLocal groupsFacade;
    

    /**
     * Processes requests for both HTTP
     * <code>GET</code> and
     * <code>POST</code> methods.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    protected void processRequest(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        response.setContentType("text/html;charset=UTF-8");
        String groupNames = request.getParameter("groups");
        String[] groups=groupNames.split(",");
        for (int i=0;i<groups.length;i++){
            Groups group=groupsFacade.findByName(groups[i]);
            Collection<Users> users=group.getUsersCollection();
            for(Users u : users){
                u.removeGroup(group);
                usersFacade.edit(u);
               
            }
            group.getUsersCollection().removeAll(users);
            
            groupsFacade.remove(group);
            
        }
    }

    // <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
    /**
     * Handles the HTTP
     * <code>GET</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Handles the HTTP
     * <code>POST</code> method.
     *
     * @param request servlet request
     * @param response servlet response
     * @throws ServletException if a servlet-specific error occurs
     * @throws IOException if an I/O error occurs
     */
    @Override
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
            throws ServletException, IOException {
        processRequest(request, response);
    }

    /**
     * Returns a short description of the servlet.
     *
     * @return a String containing servlet description
     */
    @Override
    public String getServletInfo() {
        return "Short description";
    }// </editor-fold>
}
